Type-writing machine.



No. 654,133. Patented July 24, I900.

T. CAHILL.

TYPE WRITING MACHINE.

(Application filed Feb. 1, 1898.) (No Model.) I3 Sheets-Sheet I.

No. 654133. Patented July 24, I900.

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TYPE WRITING MACHINE.

(Application filed Feb. 1, 1898.) (No Model.) l3 Sheets-Sheet 2 5 mm co. mmmm mum D c (No Model.)

T. CAHILL.

TYPE WRITING MACHINE.

{Application filed Feb. 1 1398.)

Patented July 24, I900.

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N0. 654,!33. Patented July 24, 1900. T. CAHILL.

TYPE WRITING MACHINE.

(Application filed Feb. 1,. 1898.)

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'No. 654,l33. Patented July 24, 1900. T. CAHILL.

TYPE WRITING MACHINE.

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% 17206222074 W/WM N0. 654,!33. Patented July 24, I900.

' T. CAHILL.

TYPE WRITING MACHINE.

(Application filed Feb. 1, 1898. (No Model.) l3 Sheets-Sheet 6.

No. 654.!33. Patented July 24, I900. T. CAHILL.

TYPE WRITING MACHINE.

(Application filed Feb. 1; 1898.) (No Model.) l3 Sheets-Sheet 7.

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No. 654,l33. Patent ed July 24, I900 T. CAHILL.

TYPE WRITING MACHINE.

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No. 654,!33. Patented July 24, 1900. 1'. CAHILL.

TYPE WRITING MACHINE.

(Application filed Feb. 1, 189B.) 7 (No Model.) 13 Sheets-Shoat 9.

zmnzm No. 654,133. Patented July 24, I900.

T. CAHILL.

TYPE WRITING MACHINE.

(Application filed Feb. 1, 1898.) (No Model.) l3 Sheets-Sheet In,

Patented July 24, I900.

T. GAHILL. TYPE WRITING MAGHINE.

(Application filed Feb. 1 1899.) (No Model.) l3 Sheets-Sheet ll,

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N0. B54,I33. Patented July 24, I900. I T. CAHILL.

TYPE WRITING MACHINE.

(Application filed. Feb. 1, 1898.)

(IIo Model.) l3 Sheets-Sheet I2.

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ii i IIInIIIwmIIIIIHII .I Q [away w w M m. 654,l33. Patentd July 24, I900.

- T. GAHILL.

TYPE WRITING MACHINE.

- (Application filed Feb. 1, 1898.) (No Model.) l3 Sheets-Sheet I3.

ATENT -rri.

THADDEUS CAlIlLL, or WASHINGTON, nrsrRic'r-or COLUMBIA, Assieuo'R' TO JAMES B. LAMBIE, E, HILTON JACKSON, GEORGE FREDERICK OAHILL, AND ARTHUR T. OAHILL, TRUSTEES.

TYPE-WRITING MACHINE.

SPIECIlliLlI(LA'll ON forming partof Letters Patent No. 654,133, dated July 24, 1900. Application filed February 1, 1898. Serial No. 668,737. (No model.)

To all toll/0112, it may cancer/t.-

Be it known that I, THADDEUS OAHILL, a citizen of the United States, residing in the city, county, and State of New York, tempo rarily residing at Washington, in the District of Columbia, have invented certain new and useful Improvements in Type-WVriting Machines and other Similar Instruments, of which the following is a specification.

My invention is designed, primarily, for

type-writing machines; but certain important features of my invention, hereinafter described and claimed, may be used in other instruments-such, for example, as linotype and other type-setting machines.

I shall first describe my invention as applied to a type-writing machine and will then call attention to certain features of the invention which may be used in other similar instruments, such as linotype-machines, typecomposing machines, and other keyboard printing instrumentalities.

My present invention as applied to a typewriting machine is an improvement upon the type-writing machines heretofore invented by me and described in divers patents and pending applications, and particularly it is an improvement upon the type-writing ma chine illustrated in the drawings of my pend- 0 ing application, Serial No. 641,518, filed June 19, 1897, and described in the specification of said application, (and which application has issued since the filing of this application as Letters Patent No. 604,001, dated lllay 10,

The principal objectof my invention is to make a type-writin g machine capable of writing two letters at a time, with a small number of keys controlling all the characters, as

simple in construction, durable, rapid, and

reliable in operation as possible; and my invention consists in the novel combinations hereinafter described, and particularly set forth in the statement of claim at the end 5 hereof.

My present machine, like that described in the specification of the application above mentioned,Serial No. 641,518, consists,essentially, of (A) two sets of type-bars, the type-bars of each set striking to a printing-point comm on to the type-bars of such set, the printingpoints of the two sets pftypc-barslp in 'tpreferably distinct from but adjacent to each other, as clearly'illustratedin Figures 1 and 1 (B) two type-bar-selecting devices, one for operating each set of type-bars, each of said type-bar-selecting' devices including a single motor device acting to impel all the type-bars of the set to which it corresponds, each type-bar as required, (b) keys, less in number than the type-bars of the setcontrolled by such keys, and (0) means controlled by said keys, whereby the type-bars are connected with the motor device aforesaid each as required; (0) a paper-carriage, which may be of any suitable kind or construction; (D) spacing mechanism, hereinafter fully described, and (E) the usual minor details and auxiliary parts, such as the interlineary-spacing devices, the ribbon and ribbon-feeding 7o mechanism, the alarm-bell, &c., all of which may beof any suitable kind, and of each of which several varieties are known in the art, and which, as they form no part of my present invention, I shall not burden this specification with anydescription of them,nor have I illustrated them in any of the drawings.

\Vithout making any statement of claim-in this place, and referring the reader for a statement of claim to the paragraphs of claim at the end hereof, I would say, by way of introduction, that the' novelty of the present invention as applied to a type-writing machine relates princ'ipally (a)-to certain improvements in the type-bar-selecting mechanism and in the arrangement of the parts whereby the application of power from a mo-j tor device to the type-bar impelled by it isl made more direct, the construction of, the parts simplified, and the whole machine made more compact, simple, strong, and durable; (b) to certain improvements in the type-barselecting mechanism, (but which are applicable also to shifting devices, whether of the J type-bar-selecting variety or of any other, in 5 a typewvriting machine, type-composing ma- L chine, or other similar key-operated instrument,) whereby the acting of a motor device while the shiftingis taking placeis prevented; (c) to certain other improvements whereby I00 the pin-carrier or other shifter movementtransmitting pins or other shiftable connections are arrested in the exact positions required by means of stop mechanism con appearing in or omitted from Fig. 1.

trolled by one or more of the keys at the keyboard, and (d) to certain improvements in the means for stopping themotordevice and permitting the type-bar to return to its normal position in advance of the release of the key controlling it,wh ereby an easier and more perfect adjustment and a more certain and reliable action of the parts are insured.

In the accompanying drawings, Fig. 1 is a sectional view, partly in elevation, through a type-writing machine constructed accord: ing to my invention, the plane of section being transverse to the keys and parallel with the length of the platen or paper-roll. Fig.1 is

a detail plan view illustrating thetwo sets of type-bars hereinafter described. Fig. 1 is a detail View, partly in section, partly in elevation, illustrating two type-bars, belonging onetothe right-hand-controlled set and the other toYthe left-hand-controlled set, striking simultaneously to their respective printingpoints. Fig. 2 is a detail sectional elevation in a plane parallel to the plane of Fig. 1, but nearer to the front of the machine, illustrating "certain portions of the mechanism not is a .sectional view, partly in elevation, in a plane transverse to the plane of the preceding figures,.illustrating certain positions of my type-writing machine. Fig. 4 is a detail sectionalview on the line 4 4, Fig. 1, partly in elevation, illustrating (a) the two'sets of radially-disposed levers corresponding, respecv tively, to. and connected,respectively, with the different type-bars of the two sets and (b) the two sets of group-controlling levers, as e 6 e &c., with the two sets of pins 70 k 70 &c., and the carriers K K, wherein said pins are mounted to oscillate intermediate the grouprcontrolling levers e e 6 650., and the radially disposed type bar connected levers ff, aforesaid, the group-controlling levers e 6 e 850., being in part broken away.

Fig. 5 is a detail sectional View on the line 5 5,Fig. 1, illustrating the two sets of groupcontrolling levers e e a &c. e e 6 with their ends made segmental and arranged arc fashion,with the pins controlled by said group-controlling levers seen in section in their normal positions, the pin-carriers K K being seen in plan, but partly broken away. Fig. 6 isa plan View showing the two sets of keys and certain other parts of the mechanism, the

columns 3 3 3, that support the central ring, hereinafter described, being seen in section, asalso the vertical arms of the bell-cranks FF F &c., controlled by the two sets of keys, and in this figure the circuit-closing frames 18 18 and the rock-shaft H, with its arms H H and H operated by the space keys G G, are shown in dotted lines as they lie underneath the keys. The rock-shaft H indeed, with its arms H H and H lies underneath the bed-plate, as well as underneath the keys. Fig. 7 is a detail, a plan View, of the oscillating segmental pin-can riers and the means by which they are mount- Fig. 3'

ed and by which they are arrested in their normal and in their extreme positions. Fig. 8 is a detail, a sectional View, partly in elevation, on the line 8 S, Fig. 7. Figs. 9, 10, 11, and 12 are detail views illustrating the driving mechanism. for the oscillating segmental pin-carriers, shown in-plau in Fig. 7,

.with a. portion of the stop mechanism therefor. Fig. 9 is a top view. Fig. 10 is a side elevation, partly in section, illustrating the right-hand-controlled driving and stop mechanism that serves for the left-hand one of the carriers K K. Fig.11 is a similar view illus:

trating thev left-hand-controlled driving and stop mechanism that serves for the right-hand one of the carriers K K; and Fig. 12 is an elevation illustrating the casting or standard 64., which supports the rod that serves asa pivot for the stops 61 and 62,'hereinafter described. Fig. 13 is a detail, a rear elevation, partly in section, illustrating the spacing mechanism.

Fig. 1a is a longitudinal vertical section, partly in elevation, illustrating.

minor details of construction which belong solely to mechanical skill and which every constructor varies within wide limits to suit his own ideas. In many of the figures some of the parts that would appear in a geometrical projection are omitted, either to expose other parts to View or to avoid obscuring the drawings with a multiplicity of lines. Some of the figures,indeed,are quite diagrammatic,

showing rather the idea and principle of construction than the mechanical details ofit. This is particularly true of Figs. 16 and17.

Of the main frama-The principal portions of the main frame, as illustrated in the drawings, (see particularly Figs. 14 and 15,) are (a) abed-plate 1, (b) a top plate 2, and (a) a central ring 40, supported by three columns 3 3 3, rising from the bed-plate, said ring having projections 40 10 40 40, carryingfour other columns 3 3 3 3", which rise to support the. top plate 2.

Of the two sets of type-bars, (see Figs. 1, 1, and 1".)To the top plate 2 is attached by screws a ring 2, to which the hangers a a i of the type-bars a a a a are attached by screws in the usual fashion. There are two sets of type-bars. The bars of the one set (marked a. a) strike to the printing-point A, Fig. 1. The bars of the other set (marked a a) strike to the adjacent printing-point A.

Of the per mutational type-bar-selccting de= vices, (see Figs. 1, 2, 3, 4, 5, 6, 7, and 8.)-

There are two of these devices, one for operating the set of type-bars act and the other for operating the set of type-bars a a. The two permutational type-b'ar-selecting devices are similar one to another, so that a description of one is a description of both. Let us first describe the permutational type-bar-selecting device to which the right-hand set of keys belongs and which operates the set of typebars Ct a, occupying the leftmost half of the type-bar circle. The principal parts of this device are as follows, to wit:

(a) A set of levers fff, 550., corresponding to the type-bars a a. Said levers f. f are fulcrumed by means of hangers 41 41, screwed fast to the fulcrum-ring 42, which latter is screwed fast to the central ring-40, and each of said leversff, the, is connected by a coupling 43 and a pull-down wire it with the corresponding type-bar'a. The lower end of the pull down wire it is threaded and passes through a non-threaded hole in the horizontal arm of the coupling 43, being adjustable therein by means of two lock-nuts 44 44, lying one above and the other below said horizontal arm of the coupling 43. Guide-pins 9 9, set in the central ring 40, serve to keep the levers ff, the, in their proper radial po sitions. Contractile springs f f each having one end attached to the corresponding coupling 43 and the other end attached to a shelf formed on the type-bar stop-rin g ct ,serve to hold the levers f f, 850., and the type-bars connected therewith in their normal positions, with the type-bars resting against the felted interior of the typebar stop-ring a.

(b) A motor device acting to impel all the type-bars of a set each type-bar as required. The form of motor device that I prefer to use is an electromagnet, as E in the drawings, having a soft-iron core E and a soft-iron armature E connected to the arm E of the motor-frame E which latter is centered at E (by means of steel centers E E, supported, respectively, by the standards E and E which rise from the bed-plate 1) and rests normally down upon the felted stop-bar E; but most obviously any other suitable form of electromagnet might be used instead of that shown, and, further, some other form of motor devicenot being an electromagnetcould doubtless be substituted (with corresponding variations in other parts of the device) for the electromagnet shown.

(0) A plurality of group-controlling levers, as e, 6, e e e, c, e, and 67, each adapted to control a different group of the levers ff and the type-bars connected therewith. The group-controlling levers e e e &c., are centered by means of a rod 45, set in the casting 46, which is screwed to the bed-plate and is milled out to receive the different levers e e 6 &c. The free ends of the levers e e 6 &c., are furnished with segmental pieces, all of which taken together constitute a semicircle, as shown in Fig. 5, corresponding to the semicircle which the inner ends of the radially-disposed levers f f (connected with and corresponding to the type-barsaia) form, all of which clearly appears in the drawings. Arm 47, extending from the casting 46 toward the center of the machine,'supports abar 48, on which the group-controlling levers e 6 e &c., normally rest.

(d) A plurality of pins k, 75, W, I0 10 W, 76 and (with the semicircular carrier K, wherein said pins are mounted,) corresponding, respectively, to the group-controlling levers e, 6', e e e e c and e aforesaid. Each of said pins lies above the segmental part of the group-controlling lever which corresponds'to it and below the levers f f f f, controlled by such group controlling lever, and traverses over its own group-controlling lever to bring the same into operative relation with the different levers ff, &c., of the group controlled by it and. serves to transmit movement from such group-controlling lever to the proper one of the levers ffff. Each of the pins k, 7a, 70 k It, k is, and k slides freely in the direction of its own length in the carrier K and is furnished with a collar 10 and an expansive spring k whereby the pin is held in and returned toits normal position, with the collar it resting down upon the lower flange of the carrier K.

(6) Connections hereinafter described between the group-controllinglevers e, e, 6 e 6, c 6, and e and the motor-frame E controlled by a group of keys, as O, 0 C C C C and 0 adapted to be operated by the fingers (as distinguished from the thumb) of one hand of the operator, whereby the groupcontrolling levers e e 6 &c., are connected, each as required, with the motor-frame E and motor-magnet E (f) Means controlled by a group of keys, as B, B and B adapted to be operated normally and conveniently by the thumb ofone hand, whereby the carrier K is shifted to bring the pins it M lt 850., (each of which, it will be understood, remains always in operative relation with the corresponding group-controlling levers e c 6 &c.,) into operative relation each to the different levers ffff of the groups controlled by them, thereby to connect the different type-bars of the corresponding groups with the motor device aforesaid.

(g) Means hereinafter described whereby the type-bar-impelling motor is prevented from acting to impel a type-bar while the movement-transmitting pins 76 k k 70 &c., (or any other shiftable connections that may be used) with the pin carrier K or other shifter are being positioned.

(h) Stopping means controlled bythe keys, as hereinafter described, whereby the pincarrier K with the movement-transmitting pins 70 7c 71: &c., (or any other shifting mechanism that may be used instead thereof) are arrested in the positions required.

(4') Means hereinafter described whereby the power is cut off from the type-bar-impelling motor device as the type-bar moves toward the printing-point,- so that said type-bar'- impelling-motor stops and permits the type bar also to return toward its normal position in advance of the release of the key controlling it.

The connections between the different group-controlling levers e e 6 &c., and the motor-frame E which connections are controlled by the keys (3, C C C Cfland C are as follows, to wit: To the group-controlling levers e, 6, e 6 2, e 6", and 6 respectively, are pivoted push-pieces E, E, E E,E, E, E, and E respectively, of which the push-piece E lies normally over the motor-frame E in such a position that said frame cannot be moved positively without moving the push-piece E and the group-controlling lever c, with which it is connected, while the other push-pieces E, E E E, E, E, and E lie normally clear of said motorframe E so that said frame can move with out affecting them. When moved from its normal position,the push-piece E moves away from the motor-frame E to escape being moved thereby, while the push-pieces E, E, E E E E and E each when moved from its normal position moves over said motorframe E into operative relation therewith, so that itis moved thereby. Pivoted upon rod 49 (which rod passes through a hole drilled in the bar 49, which bar is milled out to receive the bell-cranks hereinafter described) is a set of bell-cranks F, F F F F F, and F which correspond, respectively, with the keys 0, C C C C C and O and with the group-controlling levers 6', e e e e e, and 6 and each of said bell-cranks has its horizontal arm overlying an adjustable screw 49", carried by one of: the keys aforesaid, while its vertical arm is connected by a link 50 with one of the push-ups, E, E E E E E or E, as the case may be, connected with the corresponding group-controlling lever 6, e 6 e, e e", or 6 as the case may be. In a word, the bell-cranks F, F F F, F F, and F respectively, with their links 50 50, &c., are connections interposed between the keys O', 0 O C G G and 0 respectively, and the push-pieces E, E E, E E E and E respectively, whereby each of the keys G, 0 0 ,0, 0 O, and 0 respectively, when depressed throws the push-piece F, F F F F F or F", as the case may be, connected with the group- I 2 4 6 controlling lever e e 6 e e, e or e, as

the case may be, corresponding to it, over the motor-frame E so that (the circuit of the motor-magnet E being closed at the same time, by means hereinafter fully described) said motor-frame gives movement to the group-controlling lever e, 6 e e e", e, or 6 corresponding to the finger-key O, 0 C C C C or 0 as the case may be, depressed. The effect, then, of depressing the key 0 is to connect the group=controlling lever c with the motonframe E and motor-magnet E so that it receives movement therefrom. The key C when depressed connects the gronp= controlling lever c with the motor-frame E and motor-magnet E and so, in like manner, the keys C 0, C 0, and 0 respectively, when depressed connect the group-controlling levers c 6 e c and 6 respectively, with said frame E and motor-magnet E so that movement is given by them to the group controlling lever connected with them. The arrangement of the circuits,whereby the keys control the motor-magnet E will be described hereinafter. It is sufficient here to emphasize the fact that the depressing of any of the finger-keys 0, O (1 O C", C", and O by the operator causes the corresponding group-controlling lever 6, e a e", e', e, or e to be connected with the motor-frame E and motor-magnet E so that movement is im parted by said motor-magnet E and motor frame E to the group-controlling lever thus connected with them.

It has already been remarked that while the push-pieces E, E, E E E E and E corresponding to and connected, respectively, with the group-controlling lovers 6, e e, c", e e, and 6 on the one hand, and the keys 0', C C 0, C C and C, on the other hand, lie normally clear of the motor-frame E the push-piece E, connected with the group-controlling lever e, (which I shall sometimes term hereinafter the normal group-controlling lever,) lies normally over the motorframe E. In other words, while the pushpieces E, E E, E", E E, and E, with the corresponding group-controlling levers e, e e 8, e, c, and 6 are normally disconnected from the motor-frame E the push-piece E and group-controlling lever e are normally connected with the motor-frame E aforesaid and the motor-magnet E ;but when any of the bell-cranks F, F F F F F, or F is moved by the corresponding key 0, C", C C C and O to throw the corresponding push-piece E, E E E E E, and E over the motor-frame E thereby to connect the corresponding group-controlling lever e, 6 e e e e, or e ,as the case may be, with said motor-frame, said bell-crank gives movement to a frame F, (composed of vertical arms F F, centered on the rod 49 aforesaid and firmly connected by transverse bars or members F and E which lies transverse to all the bellcranks F, F F, F, F F and F of a set. The frame F when thus moved communicates movement by a link 50 to the push-piece E, moving said push-piece in the direction of the arrow, Fig. 1, away from the motor-frame E so that it is disconnected therefrom. The function of the normal bell-crank c, with its push-piece E and the frame F, will appear clearly hereinafter.

Of the construction of the pin-carriers K K 1 0 and the mechantsmfor shifting them.-There are two pin-carriers K K, lying normally in the positions illustrated in Figs. 4 and 7. The two pin-carriers are substantially alike, so that a description of one is a description of both. As I have constructed them each consists of (a) a cast hub K, with radial spokes K K K integral therewith, (6) steel pins K K K set fast in said spokes, and (c) an upper flange K and a lower flange K both of steel, riveted to the pins K K K aforesaid. The upper and lower flanges K and K are drilled to receive the pins It, 75 10 ,70 70 716 and 71: To the central one of the pins K is firmly attached an arm K to which is connected the mechanism, hereinafter described, by which the carrier is shifted. To one of the spokes K is attached a stop K and to another of said spokes is attached a similar stop K A contractile spring K", having one end attached to the arm K and the other to a threaded rod K (adjustable by a nut K) in the cross-bar K screwed fast to the bar K serves to hold the carrier K in its normal position, with the stop K attached to the spoke K resting against a fixed stop K which rises from the bar K. The carriers K K oscillate on an axle or center pin K rising from the bar K A collar K secured in place by a set-screw, serves to retain the carriers K K on the axle K. The bar K to which said axle is attached, is supported in front by the column 3 and at the rear by the column 3, rising from the bed-plate. Such are the details of the construction I have followed; but I attach no special importance to them. Anyskilled mechanic could vary them as desired. Obviously the carriermight be cast or otherwise formed in one piece instead of being built up in the manner I have described. The reason I have built mine in the way I have described is to combine strength with lightness. The pins k k 70 5 &c., occupy normally the positions illustrated in Figs. 4 and 5. Each of these pins, it will be remembered, serves to connect the corresponding group-controlling lever 6, e e e e 6 or 6 as the case maybe, with four of the levers ffff, and the pin-carrier shifts or is oscillated on its axle to carry the pins into the proper positions to act upon the different leversffff of the corresponding groups. Normally each pin acts on the first member of the group of four type-bar-connected levers ff that it serves to transmit motion to. When moved by the key B, the carrier shifts a distance equal to the distance between two adjacent leversff, so as to bring the pins each under the second lever of its group. \Vhen moved by the key B the carrier shifts a distance equal to twice that between two adjacent levers f f, so that it brings each pin into operative relation with the third lever of the group of type-bar-connected levers ff, to which such pins transmit motion, and when the carrier is moved by the depressing of the key B it moves a distance equal to three times the distance between the levers ff of the group, so that it brings the pins 10,

W, 7.2 I0 70, 7t, and k each into operative relation with the fourth lever of the group controlled by it, and the mechanism for this purpose is as follows: At the back of the machine is a rock-shaft 52, supported by centers set in the casting 53. There are, in fact,

two rock-shafts 52 with connected parts, one serving for one of the carriers K and the other serving for the other one of said carriers; but a description of one of said rockshafts and the parts connected therewith will suffice, since the two are substantially similar, as the drawings show. To the rockshaft 52 is attached a horizontal arm 54, upon which the key B acts through an adj ustment-screw 51. Said arm 54 also carries projections 55 and 56, extending upon opposite sides of it, upon which projections the keys B and B respectively act through their adjustmentscrews 51 51. (See Figs. 9, 10, and 11.) The leverages are arranged in such a manner that the key 13 gives to the arm 54 and the rock-shaft 52 and connected parts a movement of one, while the key B gives them a movement of two, and the key 13 gives them a movement of three, to shift the car rier as before described. To the rock-shaft 52 is also attached a vertical arm 57, which is connected by a link 57 with the arm K of the corresponding pin-carrier K. To said rock-shaft 52 are also attached two other vertical arms 58 58, which are firmly connected at the top bya transverse bar 59, which serves to engage the escaping-stops 61 and 62, which are fulcrumed upon a rod 60, which rod is supported by a casting or standard 64, (see Figs. 9, 10, 11, and 12,) which casting is milled out to receive the stops 61 and 62. The stop 61 serves to arrest the rock-shaft 52, with its various arms, (54, 57, 58, and 58,) and the carrier K, connected with it by the link 57, when the key B is depressed, allowing a movement of the parts sufficient to shift the pins 7a, 762, 76 R 7c, and k each from operative relation with the first one of the type-bar-connected levers ffffof the group that it controls into operative relation with the second of said type-bar-connected levers. The stop 62 serves to arrest all said parts when the key B is depressed, allowinga movement of the carrier K sufficient to shift the pins aforesaid each into operative relation.

with the third one of the type-bar-connected levers f f f f in the group controlled by it, and a fixed stop 63, attached to the bar K Fig. 7, serves to arrest all the parts when the key B is depressed, allowing a movement of the carrier K sufficient to shift the pins aforesaid each into operative relation with the fourth one of the type-bar-connected levers ffffin the group controlled by it. None of the stops is moved when the key B is depressed; but when the key B is depressed said key, acting through the push-up 65, connected with it, (the upper end of which push-up passes through an eye in the guide-piece 66, attached to the standard 64,) lifts the stop 61 out of the way before the part 59 (carried by the arms 58 5S and serving to engage the stops 61 and 62, as above mentioned) reaches it, so permitting all the parts to move until arrested by the part 59 coming in contact with the stop 62, and when the key 13 is depressed it, through a similar push-rod 65, (the upper end of which passes through another eye in the same guide piece 66, before mentioned,)

raises the stop 62 (which has connected with it a projection 62, underlying the stop 61, so that when the stop 62 is raised it raises the stop 61 with it) and the stop 61, connected with it, in the manner just described, before the part 59 comes in contact with either of 'said stops 61 and 62, so that all the parts are left'free to move until the stop K before mentioned, attached to the carrier K, comes third one of the levers f f f f controlled by it,

and the key B brings said pins each into operative relation with the fourth one of the le vers f f f f of the group controlled by it. The stop 61 serves to arrest the parts when the key B is depressed. Said stop is moved out of the way and the stop 62 serves to arrest the parts when the key B is depressed, and both of the stops 61 and 62 aforesaid are lifted out of the way when the key B is depressed, and the fixed stop 63 then serves to arrest all the parts.

Contractile springs (37 are used to return the stops 61 and 62 to their normal positions.

The permutational mechanism controlled by the left-hand keys and controlling the set of type-bars a a lying on the left-hand side of the center of the machine is in substance identical with the other per-mutational typebar-selecting mechanism, already described, controlled by the right-hand keys and controlling the set of type-bars cr a lying on the left-hand side of the center of the machine.

All this appears so plainly in the drawings that dwelling upon it here would be a mere waste of time. The two sets of type-bars a a and a a, it will be seen, together form a circle of type-bars, and the two sets of type-barconnected levers f f, &c., belonging one to the right-hand keys and to the type-bars a a and the other to the left-hand keys and the type-bars a, or, also constitute a circle. The right-hand keys, it will be observed, are conneoted to operate the left-hand set of groupcontrolling levers c e 6 &c., and the lefthand pin-carrier K, thereby to operate the left-hand set of levers ff, 850., and the set of type-bars Ct Ct connected therewith, while the left-hand keys are connected to operate the right-hand set of group-controlling levers e e a &c., and the right-hand pin-carrier K, thereby to operate the right-hand set of lovers f f and the set of type-bars a (0 connected therewith; but most obviously the righthand set of keys might be connected to operate the right-hand set of group-controlling levers e c e, &c., and the right-handpincarrier K and the right-hand set of type-bars a ct, the left-hand keys being in such case connected to operate the left-hand set of group-controlling levers c 6 e 850., with the left-hand pin-carrier K and the left-hand set of type-bars (t a. rangement illustrated in the drawings results from the fact that the right-hand, which is with most persons the more dexterous of the two, receives the more work, as it takes theinitiative, and the m ost worknecessarily falls on the hand which controls the character which prints first, for in every word that contains an odd number of letters such hand has one movement more to make than the other hand.

Ofthe arrangement ofthe electric circuits- We are now in a position to trace the electrical circuits. (See particularly Fig.17.) B is a battery or other suitable source of electrical current. Underlying all the keys of each set in front of their fulcrums is a circuit-closing frame 18 18, (see Figs. 6 and 17,) said frames being suitably mounted in points or otherwise to oscillate freely a limited distance. Each of said frames is held by a contractile spring 18 normally in contact with the stop 18"; but when any key of either set is depressed such key oscillates the frame 18 underlying it, moving said frame until a platinum contact-point 1S carried by it comes in contact with a similar contact-point set in the spring B Underlying the thumb-keys B B B of each set is a metal lever 70, which is centered at 75 and held by a contractile spring 71 normally in contact with the adjustable stop-screw 72 and which is oscillated when any of the keys B, B or B overlying it is de pressed from such (its normal) position until it is arrested by the contact-sprin g 73. The keys B, B and B are furnished with adjustmentscrews 77 to act on the lver70. The positive pole of the battery B is connected with the contact-screws 72 72 and with the contact-springs 73 73, and each of the levers is connected by a wire 7i with the contact-spring 13, with which the circuit-closing frame 18, that is operated by the same set of keys, makes connection. The function of the lever 70 of each set is to prevent the closing of the circuit of the corresponding motor-magnet E while the corresponding pin-carrier K is being shifted. If the pin-carrier K remains in its normal position, then when one of the finger-keys O, C C C O O, or O (belonging to the set which controls such pin-carrier) is depressed the current flows from the positive pole of the battery B to the contact-screw 7 2, thence to the lever 70, and from said lever by the conductor 74 to the contact-spring B but if any of the thumb-keys B, B or B be depressed such key at the same time that it depresses the frame 18 to make connection between the contact-point 18 and the contactspring B oscillates the lever from its normal position of contact with the screw 72, so that the circuit cannot be closed until said lever comes in contact, at the limit of its movement, with the contact-spring 73. From the contact-point 18 the path of the current on the two sides of the machine is in one respect different. I shall first describe the path of the current flowing from the contact-point 18, carried by the circuit-closing frame 18, that underlies the right-hand keys, and after that will describe wherein the arrangement of the circuits controlled by the left-hand keys differs. To resume, then, from the contact-point 18 carried by the circuit-closing frame 18, that underlies the right-hand keys, the current flows by the conductor 18 to the switch-lever B to which is attached the soft-iron armature B of the switch-detent magnet B and which is centered at B and held by a contractile spring B normally in contact with the ad justing-screw B". At the switch-lever B the current divides, a small portion of it going to the switch-detent magnet B and thence by the conductor B (in which is inserted the resistance R) to the space-magnet H and so back to the negative pole of the battery B while the principal part of said current flows from the switch B to the contact-screw B and thence through the magnet E controlling the lefthand set of group-controlling levers e e 6 &c., and the type-bars a a, and from said motor-magnet the current flows by the conductor E (in which is inserted the resistance R to the space-magnet II and through said magnet back to the negative pole of the battery B. The passage of the current through the motor-magnet E aforesaid causes it to attract its armature E thereby giving movement to the motor-frame E connected therewith and to whatever one of the group-controlling levers e, e, 6 e e e, c, or 6 may be connected with said motor-frame, and thus to one of the type-bars of the set Ct a. At or about the instant the type-bar strikes the platen (preferably a little before it strikes) the adjustment-screw E carried by the arm E of the motor-frame E and adjustable therein by means of a lock-nut E strikes the switch B breaking the circuit of the magnet E and throwing said switch over toward or against the stop-screw B against which said switch-lever B is now firmly held by the sWitch-detent magnet B the current through which and the strength of the magnetism of which increases greatly upon the breaking of the parallel circuit of lowerresistance through the magnet E and resistance R The circuit of the right-hand-controlled motor-magnet E being thus broken it loses its magnetism and allows the type-bar a, which hasjust been impelled by it, to return instantly to its 7 that operates the right-hand set of levers e e 6 850., with the set of type-bars a a corresponding theretowith the switoh-detent magnet B that cooperates with the motormagnet E last mentioned, might be made to be exactly like the circuits above described controlled by the right-hand keys; but while I prefer to have the type-bar of the set a ct, that acts simultaneously with one of the type bars of the set a a, strike at about the same instant I prefer also that one of said typebars (the one belonging to the set a a as things are arranged in the drawings) shall a little precede the other in arriving at the printing-point, that there shall be a phase difference in the movements of the two bars, so that any interference between them as they approach their closely adjacent printingpoints will be avoided. No phase difference,

however, is absolutely indispensable, for by leaving the two printing-points A and A of the two sets of type-bars a a and a a a sufficient distance apart the two type-bars can come up at exactly the same instant and with a unison of phase in their movements; but by giving one bar a little lead over the other (in other words, by making the bars of the set a a or the motor device controlling them a little slower acting than the bars of the set a a with their motor device, so that when the bars of the two sets operate simultaneously the one will reach the printing-point a little before the other, the bar first to print passing, as it retreats from the printing-point, the bar of the other set approaching its printing-point) it becomes possible to print the letters a little closer together, and a little less allowance may be made for wear. To effect this difference in the phases of movement of the two bars, I arrange matters in such a manner (see Fig. 17) that while the circuits of the motor-magnet E and switch-detent magnet B controlled by the right-hand keys, are closed the instant those keys are depressed the circuits of the motor-magnet E and switch-detent magnet B controlled by the left-hand keys, are not closed until an instant after such keys are depressed. The path of the current from the positive pole of the battery 13 to the platinum contact-point 18, carried by the circuit-closing frame 18, that underlies the left-hand keys, is similar, as the drawings 

